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Sildenafil is a powerful and selective inhibitor of cGMP-precise phosphodiesterase sort 5 (PDE5), and that is chargeable for degradation of cGMP while in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts for a aggressive binding agent of PDE5 while in the corpus cavernosum, causing a lot more cGMP and